Touch Control Module for Touch Device and Related Touch Control Method

ABSTRACT

A touch control module for sensing one or more touch signals from a touch device having a plurality of sensing areas, wherein each of the sensing areas having a plurality of touch units, includes a plurality of first switches; a plurality of second switches; a plurality of first sensing units, each of the first sensing unit being coupled to one of the touch units through one of the first switches; and a plurality of second sensing units, each of the second sensing units being coupled to the plurality of touch units located in the same sensing area through the plurality of second switches.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No. 62/167,279 filed on 2015 May 28, the contents of which are incorporated herein in their entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a touch control module for a touch device and related touch control method, and more particularly, to a touch control module capable of increasing sensitivity of a touch device and related touch control method.

2. Description of the Prior Art

Along with the development of the touch sensing technique, the commercially available touch panels are extensively used for various sizes or products such as mobile phone, GPS navigator system, tablet PC, PDA, and laptop PC, owing to their convenience and practicality.

The panel manufacturers continue to develop thinner and more accurate touch panels. In recent year, touch panels of an in-cell structure attract lots of attention. Via building sensing elements inside the display structure of the panel, the in-cell structure eliminates a layer. The visible distance between the user's finger and what the user is touching on the touch panel is therefore reduced, creating a more direct contact with the content displayed and enabling taps and gestures to be more responsive. In addition, the touch panel becomes thinner since the layer is eliminated in the in-cell structure.

The touch panel of the in-cell structure senses the touches according to capacitance variances of a plurality of touch pads in response to the touches. A smaller area of each of the touch pads can acquire a greater touch resolution of the touch panel. However, the capacitance variance generated by each of the touch pads also becomes smaller when the area of each of the touch pads decreases. The touch panel may fail to determine a hover operation because the capacitance variance generated by each of the touch pads is too small to be determined when the user's hand maintains a certain distance with the touch panel. Thus, how to improve the reliability of determining the hover operation while maintaining the fine touch resolution of the touch panel becomes a topic to be discussed.

SUMMARY OF THE INVENTION

In order to solve the above problem, the present invention provides a touch control module capable of increasing sensitivity of a touch device and related touch control method.

In an aspect, the present invention discloses a touch control module for sensing one or more touch signals from a touch device. The touch device has a plurality of sensing areas and each of the sensing areas has a plurality of touch units. The touch control module comprises a plurality of first switches, a plurality of second switches, a plurality of first sensing units, and a plurality of second sensing units. Each of the first sensing units is coupled to one of the touch units through one of the first switches and each of the second sensing units is coupled to the touch units located in the same sensing area through one of the second switches.

In another aspect, the present invention discloses an electronic system. The electronic system comprises a touch device, a plurality of first switches, a plurality of second switches, a plurality of first sensing units, and a plurality of second sensing units. The touch device has a plurality of sensing areas and each of the sensing areas has a plurality of touch units. Each of the first sensing units is coupled to one of the touch units through one of the first switches and each of the second sensing units is coupled to the touch units located in the same sensing area through one of the second switches.

In another aspect, the present invention discloses a touch control method for sensing one or more touch signals from a touch device, wherein the touch device has a plurality of sensing areas and each of the sensing areas having a plurality of touch units. The touch control method comprises determining whether to increase a sensitivity of the touch device; electrically connecting the plurality of touch units located in the same sensing area when determining to increase the sensitivity of the touch device; and sensing one or more the touch signals from the touch device.

In another aspect, the present invention discloses a touch control method for sensing one or more touch signals from a touch device having a plurality of sensing areas, wherein each of the sensing areas having a plurality of touch units. The touch control method comprises alternately, electrically connecting the plurality of touch units located in the same sensing area; determining a plurality of first capacitance variances in the plurality of sensing areas and determining a plurality of second capacitance variances in the plurality of touch units, separately, in each of the sensing areas, to sense one or more touch signals; and adjusting a frequency of alternately connecting the plurality of touch units in each of the sensing areas.

By utilizing the touch control module and the touch control method of the present invention, not only the sensitivity of the touch device can be increased but also the power consumption of the touch device can be reduced.

These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of an electronic system according to an example of the present invention.

FIG. 2 is a schematic diagram of an electronic system according to an example of the present invention.

FIG. 3 is a schematic diagram of an electronic system according to an example of the present invention.

FIG. 4 is a schematic diagram of an electronic system according to an example of the present invention.

FIG. 5 is a flowchart of a process according to an example of the present invention.

FIG. 6 is a flowchart of another process according to an example of the present invention.

DETAILED DESCRIPTION

Please refer to FIG. 1, which is a schematic diagram of an electronic system 10 according to an example of the present invention. The electronic system 10 may be an electronic product such as a smart phone, a tablet or a notebook, and is not limited herein. As shown in FIG. 1, the electronic system 10 comprises a touch device 100 and a sensing device 102. Note that, the components not directly related to the concept of the present invention, such as housing, display components, and display control circuit, are not shown in FIG. 1 for brevity. The touch device 100 may be a touch pad configured in a display panel and comprises a plurality of touch units P11-Pmn (e.g. sensing pads). FIG. 1 shows touch units P11-P44 for illustrations. The touch device 100 is utilized for generating capacitance variances in response to at least one approaching or touch of an object (e.g. a fingertip or a stylus pen). The sensing device 102 comprises a touch control module TCM and a sensing module 104 and is utilized for determining the capacitance variances generated by the touch units P11-Pmn. In this example, the touch control module TCM is capable of connecting the multiple touch units among the touch units P11-Pmn (e.g. the touch units P11, P12, P21, and P22), so as to increase the sensitivity of the touch device 100.

In details, the touch control module TCM comprises switch units SW1_11-SW1_mn and SW2_11-SW2_ij, wherein the switch units SW1_11-SW1_22 and SW2_11 are shown in FIG. 1 for illustrations. The switch units SW1_11-SW1_mn are respectively coupled between one of the touch units P11-Pmn and one of sensing units SU1_11-SU1_mn of the sensing module 104, and each of the switch units SW2_11-SW2_ij is coupled between the touch units located in one of a plurality of sensing areas SA_11-SA_ij and one of the sensing units SU2_11-SU2_ij. Each of the sensing areas SA_11-SA_ij comprises multiple neighborhood touch units among the touch units P11-Pmn and the sensing module 104. In FIG. 1, the touch units P11, P12, P21, and P22 are coupled to the switch units SW1_11, SW1_12, SW1_21, and SW1_22, respectively, and the sensing units SU1_11, SU1_12, SU1_21, and SU1_22 are coupled to the switch units SW1_11, SW1_12, SW1_21, and SW1_22. The sensing area SA_11 comprises touch units P11, P12, P21, and P22 that form a 2*2 touch unit array; the sensing area SA 12 comprises touch units P13, P14, P23, and P24 that form another 2*2 touch unit array; and so on. The touch control module TCM selects to conduct the switch units SW1_11-SW1_mn or the switch units SW2_11-SW2_ij according to a control signal CON and an inverse control signal CONB which is an inverse signal of the control signal CON. The control signal CON and the inverse control signal CONB are generated by a control unit (not shown in FIG. 1) and the control unit may be configured in the sensing module 104. In an example, the switch units SW1_11-SW1_mn are conducted in a normal mode, the switch units SW2_11-SW2_ij are conducted in a grouping mode, and the switch units SW1_11-SW1_mn and the switch units SW2_11-SW2_ij are not conducted simultaneously.

In a normal mode, the switch units SW1_11-SW1_mn are conducted. The sensing units SU1_11-SU1_mn of the sensing module 104 receive the signals related to capacitance variances CV1_11-CV1_mn respectively generated in the touch units P11-Pmn. The sensing module 104 determines the capacitance variances CV1_11-CV1_mn respectively generated in the touch units P11-Pmn and accordingly determines the touch positions at which the object approaches or contacts. Since the capacitance variances CV1_11-CV1_mn are respectively generated by the touch units P11-Pmn, the sensing module 104 is able to determine the approaching or the contact of the object in a fine touch resolution of the level of touch units P11-Pmn. When the object maintains a certain distance respect to the touch device 100 (e.g. perform a hover operation), however, the capacitance variance generated by each of the touch units P11-Pmn reduces significantly. For example, when the object contacts the touch device 100 (i.e. the distance between the object and the touch device 100 is 0), the capacitance variances generated in each of the touch units contacted by the object may be 0.9 pF. In comparison, when the distance between the object and the touch device 100 is 1 mm, the capacitance variances generated in each of the touch units close to the object may reduce to 0.1 pF. Under such a condition, the capacitance variance generated by each of the touch units P11-Pmn in response to the approaching of the object may be too small to make the sensing module 104 determine the approaching of the object.

In order to increase the sensitivity of the touch device 100, the touch device 100 change to operate in a grouping mode. In the grouping mode, the control unit adjusts the control signal CON and the inverse control signal CONB to make the touch control module TCM disconnect the switch units SW1_11-SW1_mn and conduct the switch units SW2_11-SW2_ij, to connect the touch units in the same sensing area together. Please refer to FIG. 2, the touch units in the same sensing area are connected together by the switch units SW2_11-SW2_ij (e.g. the touch units P11, P12, P21, and P22 are connected together when switches SW2_11_1-SW2_11_4 of the switch unit SW2_11 are conducted). The sensing module 104 changes to use the sensing units SU2_11-SU2_ij to determine capacitance variances CV2_11-CV2_ij jointly generated by the touch units in the same sensing area among the sensing areas SA_11-SA_ij. Since the number of touch units of generating each of the capacitance variances CV2_11-CV2_ij is greater than that of touch units of generating each of the capacitance variances CV1_11-CV1_mn, the area of generating each of the capacitance variances CV2_11-CV2_ij (i.e. the area of each of the sensing areas SA_11-SA_ij) is greater than that of generating each of the capacitance variances CV1_11-CV1_mn (i.e. the area of each of the touch units P11-Pmn). Thus, the capacitance variances CV2_11-CV2_ij in response to the approaching or the contact of the object are greater than the capacitance variances CV1_11-CV1_mn in response to the approaching or the contact of the object. In other words, the capacitor variances CV2_11-CV2_ij generated in response to the approaching or the contact of the object and sensed by the sensing module 104 are enlarged. According to the enlarged capacitor variances CV2_11-CV2_ij, the sensing module 104 is able to determine the approaching of the object when the object maintains a certain distance with the touch device 100 and the capacitance variance generated by each of the touch units P11-Pmn is too small to allow the sensing module 104 to determine the approaching of the object. The sensitivity of the touch device 100 is therefore increased. In addition, the power consumption of the sensing module 104 decreases when conducting the switch units SW2_11-SW2_ij because the number of times of scanning the capacitance variances generated in the touch device 100 is decreased from m*n to i*j and the time of scanning the capacitance variances in the touch device 100 is also decreased.

Note that, the switch unit SW1_11 and the switch SW2_11_1 of the switch unit SW2_11 can be regarded as a multiplexer controlled by the control signal CON and the inverse control signal CONB; the switch unit SW1_12 and the switch SW2_11_2 of the switch unit SW2_11 can be regarded as another multiplexer controlled by the control signal CON and the inverse control signal CONB; and so on. In other words, the touch control module TCM shown in FIG. 1 can be realized by a plurality of multiplexers controlled by the control signal CON and the inverse control signal CONB. The multiplexers conduct the connections between each of the touch units P11-Pmn and each of the sensing units SU1_11-SU1_mn or conduct the connections between each of the touch units P11-Pmn and each of the sensing units SU2_11-SU2_ij according to the control signal CON.

According to different applications and design concepts, the number of the touch units connected by the switch units SW2_11-SW2_ij can be altered. Please refer to FIG. 3, which is a schematic diagram of an electronic system 30 according to an example of the present invention. The electronic system 30 may be an electronic product such as a smart phone, a tablet or a notebook, and is not limited herein. Because the electronic system 30 is similar to the electronic system 10 shown in FIG. 1, the components and signals with the same functions use the same symbols. In FIG. 3, each of the sensing areas SA_11-SA_ij comprises 9 touch units that form a 3*3 touch unit array. For example, the sensing area SA_11 comprises the touch units P11-P13, P21-P23, and P31-P33 in FIG. 3. When the switch units SW2_11-SW2_ij are conducted in the grouping mode, the touch units located in the same sensing area are connected together and the sensing units SU2_11-SU2_ij respectively determine the capacitance variances CV2_11-CV2_ij in the sensing areas SA_11-SA_ij. Since the areas of the sensing areas SA_11-SA_ij increases in FIG. 3, the sensitivity of the electronic system 30 determining the approaching or the contact of the object is further increased. In addition, the number of times of scanning the capacitance variances generated by the touch device 300 in FIG. 3 is a ninth of the number of times of scanning the capacitance variances generated by the touch device 100 in FIG. 1. The power consumption of the sensing module 304 is reduced with the number of times of scanning the capacitance variances.

The timing of the sensing module 104 switching to conduct the switch units SW1_11-SW1_mn or SW2_11-SW2_ij may be various. In an example, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij when determining that the electronic system 10 performs a specific function that does not require high touch resolution (e.g. an electronic book application). When determining that the electronic system 10 ends the specific function, the sensing module 104 changes to conduct the switch units SW1_11-SW1_mn.

In an example, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij when determining the object perform a predefined touch pattern. For example, the predefined touch pattern may be “S” pattern. When determining that the object draws “S” according to the capacitance variances CV1_11-CV1_mn, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij. In another example, the predefined touch pattern may be a contact pattern of the object. For example, when the sensing module 104 determines that, according to the capacitance variances CV1_11-CV1_mn, the object contacts a fourth area of the touch device 100, the sensing module 104 disconnects the switch units SW1_11-SW1_mn and conducts the switch units SW2_11-SW2_ij.

In another example, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij according to the capacitance variances CV1_11-CV1_mn and a signal transmitted from the object. For example, the object may be a stylus pen capable of transmitting a signal in a specific frequency band. When determining receiving the signal in the specific frequency band (i.e. determines the object is the stylus pen) and the capacitance variances in response to the approaching or the contact of the object exceeds a threshold, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij. When the signal in the specific frequency band disappears or the capacitance variances in response to the approaching or the contact of the object become smaller than the threshold, the sensing module 104 disconnects the switch units SW2_11-SW2_ij and conducts the switch units SW1_11-SW1_mn.

In an example, the sensing module 104 alternately conducts the switch units SW1_11-SW1_mn and the switch units SW2_11-SW2_ij and adjusts the ratio between the times of conducting the switch units SW1_11-SW1_mn and those of conducting the switch units SW2_11-SW2_ij. For example, the sensing module 104 conducts the switch units SW1_11-SW1_mn for determining the capacitance variances CV1_11-CV1_mn 7 times and conducts the switch units SW2_11-SW2_ij for determining the capacitance variances CV2_11-CV2_ij 3 times per 10 times of scanning the capacitance variances in the touch device 100. When determining the capacitance variances in responses to the approaching or the contact of the object among the capacitance variances CV1_11-CV1_mn and CV2_11-CV2_ij are saturated, the sensing module 104 changes to conduct the switch units SW2_11-SW2_ij 7 times and to conduct the switch units SW1_11-SW1_mn 3 times per 10 times of scanning the capacitance variances in the touch device 100. In an example, the capacitance variances in responses to the approaching or the contact of the object and among the capacitance variances CV1_11-CV1_mn are saturated if capacitance variances in responses to the approaching or the contact of the object reach a threshold TH1, and the capacitance variances in responses to the approaching or the contact of the object and among the capacitance variances CV2_11-CV2_ij are saturated if capacitance variances in responses to the approaching or the contact of the object reach a threshold TH2. The threshold TH2 is greater than the threshold TH1 because the number of the touch units generating each of the capacitance variances CV2_11-CV2_ij is greater than that of the touch units generating each of the capacitance variances CV1_11-CV1_mn. For example, the threshold TH2 is four times the threshold TH1 when each of the sensing areas SA_11-SA_ij comprises 4 touch units. The sensing module 104 may change to conduct the switch units SW1_11-SW1_mn 7 times and to conduct the switch units SW2_11-SW2_ij 3 times per 10 times of scanning the capacitance variances in the touch device 100 when determining the capacitance variances in responses to the approaching or the contact of the object among the capacitance variances CV1_11-CV1_mn maintain saturated and the capacitance variances in responses to the approaching or the contact of the object among CV2_11-CV2_ij are not saturated.

In an example, the sensing module 104 disconnects the switch units SW1_11-SW1_mn and conducts the switch units SW2_11-SW2_ij when the electronic system 10 enters a power saving mode, to lower the power consumption of the sensing module 104. After the electronic system 10 wakes up and enters a normal operation mode, the sensing module 104 disconnects the SW2_11-SW2_ij and changes to conduct the switch units SW1_11-SW1_mn.

The touch control module TCM of the above examples is capable of connecting multiple touch units in the touch device, to increase the sensitivity of the touch device. According to different application and design concepts, those skilled in the art may observe appropriate alternations and modifications. For example, the shapes of the sensing areas SA_11-SA_mn is not limited to be rectangles. That is, the touch units in the same sensing area are not limited to form a rectangle. In an example, the shapes of the sensing areas SA_11-SA_mn are rectangles, circles or half-circles.

Please refer to FIG. 4, which is a schematic diagram of an electronic system 40 according to an example of the present invention. The electronic system 40 is similar to the electronic system 10 shown in FIG. 1, thus the components and signals with similar functions use the same symbols. Different from FIG. 1, the touch control module TCM changes to be configured in the touch device 400. The connection relationships between the touch units P11-Pmn and the switch units SW1_11-SW1_mn and SW2_11-SW2_ij shown in FIG. 4 can be referred to the above and are not narrated herein for brevity.

The method of the touch control module switching the connection between the touch device and the sensing module in the above examples can be summarized into a process 50 shown in FIG. 5. The process 50 is utilized for sensing one or more touch signals from a touch device having a plurality of sensing areas, wherein each of the sensing areas has a plurality of touch units. The process 50 comprises the following steps:

Step 500: Start.

Step 502: Determine whether to increase a sensitivity of the touch device, perform step 504 when determining to increase the sensitivity of the touch device, otherwise perform step 508. Step 504: Electrically connect the plurality of touch units located in the same sensing area. Step 506: Sense one or more the touch signals from the touch device.

Step 508: End.

According to the process 50, the sensing module determines whether to increase a sensitivity of the touch device according to the operations of the electronic system. In an example, the sensing module determines to increase the sensitivity of the touch device when the touch device performs a specific function that does not require high touch resolution (e.g. an electronic book application). In another example, the sensing module determines to increase the sensitivity of the touch device when determining the one or more touch signals perform a predefined touch pattern on the touch device. The predefined touch pattern may be a move pattern of the object (e.g. “S” move pattern) or a contact pattern of the object. In still another example, the sensing module determines to increase the sensitivity of the touch device when receiving a signal in the specific frequency band from the object approaching the electronic system and determining the capacitance variances of the plurality of touch units in response to the approaching or the contact of the object exceeds a threshold. In an example, the sensing module determines to increase the sensitivity of the touch device when the touch device enters a power saving mode.

When determining to increase the sensitivity of the touch device, the touch units in each of a plurality of sensing areas are connected together. The shape of each of the sensing area may be altered according to different applications and design concepts. For example, each of the sensing areas may be a rectangle, a circle, or a half-circle. After the touch units in each of the sensing areas are connected, the touch control module determines the capacitance variances generated by the touch units in each of the sensing areas, to sense one or more touch signals from the touch device. Since the area of single touch units is smaller than that of the sensing areas comprising multiple touch units, the sensitivity of the touch device is increased when multiple touch units in the same sensing area are connected together.

The method of the touch control module switching the connection between the touch device and the sensing module in the above examples can be summarized into a process 60 shown in FIG. 6. The process 60 is utilized for sensing one or more touch signals from a touch device with a plurality of sensing areas, wherein each of the sensing areas has a plurality of touch units. The process 60 comprises the following steps:

Step 600: Start.

Step 602: Alternately, electrically connect the touch units in each of a plurality of sensing areas. Step 604: Determine a plurality of first capacitance variances of the plurality of sensing areas and determine a plurality of second capacitance variances of the plurality of touch units, separately, in each of the sensing areas, to sense the one or more touch signals. Step 606: Adjust a frequency of alternately connecting the touch units in each of the sensing areas.

Step 608: End.

According to the process 60, the touch units in each of a plurality of sensing areas are alternately, electrically conducted (i.e. alternately switching between the normal mode and the grouping mode), to sense one or more touch signals from the touch device. In the grouping mode, the touch units in each of sensing areas are electrically connected together and a plurality of first capacitance variances of the plurality of sensing areas are determined. In the normal mode, the capacitance variance of each of touch units is acquired as one of a plurality of second capacitance variances. The one or more touch signals are sensed according to the first capacitance variances and the second capacitor variances.

The frequency of alternately conducting the touch units in each of the sensing areas is adjusted according to the first capacitance variances and the second capacitance variances in response to the one or more touch signals. For example, the touch units in each of the sensing areas are conducted 3 times per 10 times of scanning the capacitance variances in the touch device at first, to determine the second capacitance variances of the touch units are determined 7 times and the first capacitance variances of the sensing areas 3 times. When the first capacitance variances in response to the one or more touch signals are greater than a first threshold and the second capacitance variances in response to the one or more touch signals are greater than a second threshold, the frequency of alternately conducting the touch units in each of the sensing areas increases. For example, the touch units in each of the sensing areas change to be conducted 7 times per 10 times of scanning the capacitance variances in the touch device. When the first capacitance variances in response to the approaching or contact of the object is smaller than the first threshold and the second capacitance variances in response to the approaching or contact of the object maintain greater than the second threshold, the frequency of alternately conducting the plurality of touch units in each of the sensing areas decreases. For example, the touch units in each of the sensing areas change to be conducted 3 times per 10 times of scanning the capacitance variances in the touch device. Note that, the first threshold is greater than the second threshold because the number of the touch units generating each of the first capacitance variances is greater than that of the touch units generating each of the second capacitance variances. In an example, the first threshold is four times the second threshold when each of the sensing areas comprises 4 touch units.

The touch control module of the above examples is capable of connecting multiple touch units, to increases the area of generating the capacitance variance. The sensitivity of the touch device is therefore increased. In addition, the power consumption of the electronic system is reduced because the number of times of scanning the capacitance variances decreases when the multiple touch units are connected together.

Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims. 

What is claimed is:
 1. A touch control module for sensing one or more touch signals from a touch device having a plurality of sensing areas, each of the sensing areas having a plurality of touch units, the touch control module comprising: a plurality of first switches; a plurality of second switches; a plurality of first sensing units, each of the first sensing unit being coupled to one of the touch units through one of the first switches; and a plurality of second sensing units, each of the second sensing units being coupled to the plurality of touch units located in the same sensing area through the plurality of second switches.
 2. The touch control module of claim 1, wherein the plurality of sensing areas are at least one of rectangles, circles, and half-circles.
 3. The touch control module of claim 1, wherein the plurality first switches are conducted in a normal mode, to connect each of the first sensing units to one of the plurality of touch units in each of the sensing areas; the plurality of second switches are conducted in a grouping mode, to connect each of the second sensing units to the plurality of touch units in each of the sensing areas; and the plurality first switches and the plurality second switches are not simultaneously conducted.
 4. An electronic system, comprising: a touch device, comprising a plurality of sensing areas, each of the sensing areas having a plurality of touch units; a plurality of first switches; a plurality of second switches; a plurality of first sensing units, each of the first sensing unit being coupled to one of the touch units through one of the first switches; and a plurality of second sensing units, each of the second sensing units being coupled to the plurality of touch units located in the same sensing area through the plurality of second switches.
 5. The electronic system of claim 4, wherein the plurality of sensing areas are at least one of rectangles, circles, and half-circles.
 6. The electronic system of claim 4, wherein the plurality first switches are conducted in a normal mode, to connect each of the first sensing units and one of the plurality of touch units in each of the sensing areas and each of the first sensing units; the plurality of second switches are conducted in a grouping mode, to connect each of the second sensing units and the plurality of touch units in each of the sensing areas; and the plurality first switches and the plurality second switches are not simultaneously conducted.
 7. A touch control method for sensing one or more touch signals from a touch device having a plurality of sensing areas, each of the sensing areas having a plurality of touch units, the touch control method comprising: determining whether to increase a sensitivity of the touch device; electrically connecting the plurality of touch units located in the same sensing area when determining to increase the sensitivity of the touch device; and sensing the one or more the touch signals from the touch device.
 8. The touch control method of claim 7, wherein the plurality of sensing areas are at least one of rectangles, circles or half-circles.
 9. The touch control method of claim 7, wherein the step of determining whether to increase the sensitivity of the touch device comprises: determining to increase the sensitivity of the touch device when the touch device performs a specific function.
 10. The touch control method of claim 7, wherein the step of determining whether to increase the sensitivity of the touch device comprises: determining to increase the sensitivity of the touch device when the one or more touch signals perform a predefined touch pattern.
 11. The touch control method of claim 10, wherein the predefined touch pattern is a move pattern of the object.
 12. The touch control method of claim 10, wherein the predefined touch pattern is a contact pattern of the object.
 13. The touch control method of claim 7, wherein the step of determining whether to increase the sensitivity of the touch device comprises: determining amplitudes of capacitance variances in response to the one or more touch signals and generated by each of the touch units of each of the sensing areas; and determining to increase the sensitivity of the touch device when receiving an emitting signal in a frequency band and the capacitance variances in response to the one or more touch signal is greater than a threshold.
 14. The touch control method of claim 7, wherein the step of determining whether to increase the sensitivity of the touch device comprises: determining to increase the sensitivity of the touch device when the touch device enters a power saving mode.
 15. A touch control method for sensing one or more touch signals from a touch device having a plurality of sensing areas, each of the sensing areas having a plurality of touch units the touch control method comprising: alternately, electrically connecting the plurality of touch units located in the same sensing area; determining a plurality of first capacitance variances in the plurality of sensing areas and determining a plurality of second capacitance variances in the plurality of touch units, separately, in each of the sensing areas, to sense one or more touch signals; and adjusting a frequency of alternately connecting the plurality of touch units in each of the sensing areas.
 16. The touch control method of claim 15, wherein the step of adjusting the frequency of alternately connecting the plurality of touch units in each of the sensing areas comprises: increasing the frequency of alternately connecting the plurality of touch units in each of the sensing areas when the first capacitance variances in response to the object are greater than a first threshold and the second capacitance variances in response to the object are greater than a second threshold.
 17. The touch control method of claim 15, wherein the step of adjusting the frequency of alternately connecting the touch units in each of the sensing areas comprises: decreasing the frequency of alternately connecting the plurality of touch units in each of the sensing areas when the first capacitance variances in response to the object are smaller than a first threshold and the second capacitance variances in response to the object are greater than a second threshold. 